package org.apache.maven.repository.metadata;

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

import org.apache.maven.artifact.ArtifactScopeEnum;

/**
 * metadata graph edge - combination of version, scope and depth define an edge in the graph
 *
 * @author <a href="oleg@codehaus.org">Oleg Gusakov</a>
 *
 */

public class MetadataGraphEdge {
  String version;
  ArtifactScopeEnum scope;
  int depth = -1;
  int pomOrder = -1;
  boolean resolved = true;
  String artifactUri;

  /**
   * capturing where this link came from and where it is linked to.
   *
   * In the first implementation only source used for explanatory function
   */
  MetadataGraphVertex source;
  MetadataGraphVertex target;

  // ----------------------------------------------------------------------------
  public MetadataGraphEdge(String version, boolean resolved, ArtifactScopeEnum scope, String artifactUri, int depth, int pomOrder) {
    super();
    this.version = version;
    this.scope = scope;
    this.artifactUri = artifactUri;
    this.depth = depth;
    this.resolved = resolved;
    this.pomOrder = pomOrder;
  }

  // ----------------------------------------------------------------------------
  /**
   * helper for equals
   */
  private static boolean objectsEqual(Object o1, Object o2) {
    if (o1 == null && o2 == null) {
      return true;
    }
    if ((o1 == null && o2 != null) || (o1 != null && o2 == null)) {
      return false;
    }
    return o1.equals(o2);
  }

  // ----------------------------------------------------------------------------
  /**
   * used to eliminate exact duplicates in the edge list
   */
  @Override
  public boolean equals(Object o) {
    if (o instanceof MetadataGraphEdge) {
      MetadataGraphEdge e = (MetadataGraphEdge) o;

      return objectsEqual(version, e.version)
          && ArtifactScopeEnum.checkScope(scope).getScope().equals(ArtifactScopeEnum.checkScope(e.scope).getScope())
          && depth == e.depth;
    }
    return false;
  }

  // ----------------------------------------------------------------------------
  public String getVersion() {
    return version;
  }

  public void setVersion(String version) {
    this.version = version;
  }

  public ArtifactScopeEnum getScope() {
    return scope;
  }

  public void setScope(ArtifactScopeEnum scope) {
    this.scope = scope;
  }

  public int getDepth() {
    return depth;
  }

  public void setDepth(int depth) {
    this.depth = depth;
  }

  public boolean isResolved() {
    return resolved;
  }

  public void setResolved(boolean resolved) {
    this.resolved = resolved;
  }

  public int getPomOrder() {
    return pomOrder;
  }

  public void setPomOrder(int pomOrder) {
    this.pomOrder = pomOrder;
  }

  public String getArtifactUri() {
    return artifactUri;
  }

  public void setArtifactUri(String artifactUri) {
    this.artifactUri = artifactUri;
  }

  public MetadataGraphVertex getSource() {
    return source;
  }

  public void setSource(MetadataGraphVertex source) {
    this.source = source;
  }

  public MetadataGraphVertex getTarget() {
    return target;
  }

  public void setTarget(MetadataGraphVertex target) {
    this.target = target;
  }

  @Override
  public String toString() {
    return "[ " + "FROM:("
        + (source == null ? "no source" : (source.md == null ? "no source MD" : source.md.toString())) + ") " + "TO:("
        + (target == null ? "no target" : (target.md == null ? "no target MD" : target.md.toString())) + ") "
        + "version=" + version + ", scope=" + (scope == null ? "null" : scope.getScope()) + ", depth=" + depth + "]";
  }
  // ----------------------------------------------------------------------------
  // ----------------------------------------------------------------------------
}
